For anyone with Virgin Media, after reading around on their forums I found a potential fix for the disconnects that has actually worked for me, at least so far. After switching my Superhub 2ac to Modem Mode, I was able to do four story instances without any connection problems. Normally I would have to be constantly moving + autoattacking to avoid being disconnected, but since trying this I was able to stand idle and even watch cutscenes without any issues. Just bear in mind that while in Modem Mode you won't have access to Wi-Fi unless you connect a standalone router. Fingers crossed this holds up. :)